refactor(api-core): rename routing.py to client_utils.py as consolidated client helper

Author: hebaalazzeh

packages/google-api-core/google/api_core/gapic_v1/__init__.py

@@ -29,7 +29,7 @@
     "google.api_core.gapic_v1.client_utils",
     "google.api_core.gapic_v1.config_helpers",
     "google.api_core.gapic_v1.requests",
-    "google.api_core.gapic_v1.routing",
+    "google.api_core.gapic_v1.client_utils",
     "google.api_core.gapic_v1.routing_header",
 }
 __all__ = [
@@ -38,7 +38,7 @@
     "client_utils",
     "config_helpers",
     "requests",
-    "routing",
+    "client_utils",
     "routing_header",
 ]
 
@@ -58,7 +58,7 @@
     client_utils,
     config_helpers,
     requests,
-    routing,
+    client_utils,
     routing_header,
 )